package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * @author xiaobai
 * @create 2024-01-26 13:04
 */

/*
 * 新增菜品和对应的口味   涉及到了两张表的操作  菜品表和口味表  所以需要用到事务管理
 * */

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;


    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        //创建dish对象
        Dish dish = new Dish();
        //通过属性拷贝  将DTO中关于菜品的属性拷贝到dish对象中
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入1条数据      由于插入语句较多 这边考虑写入XML文件中去
        dishMapper.insert(dish);

        //获取上一条insert语句生成的主键值
        Long dishId = dish.getId();

        //向口味表插入N条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {

            //给每个口味赋值ID
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });

            //向口味表中插入n条数据
            dishFlavorMapper.insertBatch(flavors);

        }


    }

    /*
     * 菜品分页查询
     * */

    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(), page.getResult());
    }


    /*
     * 批量删除菜品
     * */

    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断菜品是否可以删除 --- 是否存在起售状态下的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }

        }

        //判断菜品是否可以删除 --- 是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.getSetMealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //当前菜品被套餐关联
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //删除菜品所关联的口味
//            dishFlavorMapper.deleteByDishId(id);
//        }


        //根据id集合 批量删除菜品
        dishMapper.deleteByIds(ids);


        //根据菜品id集合 批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /*
     * 根据ID查询菜品
     * */

    @Transactional
    public DishVO getByIdWithFlavor(Long id) {
        //根据ID查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品ID查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //进行数据封装   VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;

    }


    /*
     * 修改菜品基本信息和对应的而口味信息
     * */
    public void updateWithFlavor(DishDTO dishDTO) {
        //修改菜品基本信息   由于DTO中包含口味信息 所以先new一个Dish对象 通过属性拷贝 修改菜品基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        dishMapper.update(dish);

        //删除原有口味信息

        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {

            //给每个口味赋值ID
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });

            //向口味表中插入n条数据
            dishFlavorMapper.insertBatch(flavors);

        }

    }


    /*
    * 根据分类id查询菜品信息
    * */
    public List<Dish> list(Long categoryId) {
        Dish dish=Dish.builder().categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();

        return dishMapper.list(dish);

    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
    /**
     * 菜品起售停售
     *
     * @param status
     * @param id
     */
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }


}
